Evolutionary Processes in Neogene Planktonic Foraminifera atHigh Resolution and Paleoceanography

P.I.S之前的研究为理解进化过程提供了许多新的数据，并重申了对晚第三纪浮游有孔虫Globoconella群研究在进化洞察方面的高潜力的信念。简而言之，有几个主要因素结合在一起，提供了可以通过这个项目开发的机会：1.在新近纪晚期(7 Ma到现在)连续取心的沉积序列中保存完好的大量可测量样品，由于使用液压活塞取样器而产生的岩心质量，提供了很高的时间分辨潜力。2.物种形态(生物统计)调查表明，在所有纬度都有明显的进化变化。3.对序列的足够广泛的地理覆盖将揭示迁徙和生物竞争在进化过程中的作用。4.被海洋锋面隔开的不同表层水团中序列的位置，在过去的几百万年里，它们是浮游有孔虫物种的部分障碍，也是基因流动的部分障碍。5.存在来自正在进行进化调查的同一地点的古海洋信息。这包括氧和碳同位素地层学和浮游有孔虫组合的丰度变化。6.一套易于识别的形态测量特征，现在可以使用成熟的方法进行准确和快速的测量。

The P.I.'s previous studies have provided much new data towards an understanding of evolutionary processes and have reaffirmed the belief in the high potential of studies of the late Neogene planktonic foraminiferal Globoconella group for evolutionary insights. Briefly, there are several principal factors that, in combination, provide opportunities that may be exploited through this program: 1. Large numbers of well-preserved, measurable specimens in continuously cored sedimentary sequences of late Neogene age (7 Ma to present) offer a high potential for time resolution due to core quality resulting from use of the hydraulic piston corer. 2. Clear evolutionary changes at all latitudes shown by the species shape (biometric) investigations. 3. Sufficiently broad geographic coverage of the sequences will reveal the role of migration and biotic competition in the evolutionary process. 4. The location of sequences in distinct surface water masses separated by oceanographic fronts acting as partial barriers to planktonic foraminiferal species and which acted as partial barriers to gene flow during the last several million years. 5. The existence of paleoceanographic information from the same sites for which the evolutionary investigations are being conducted. This includes oxygen and carbon isotopic stratigraphy and abundance variations in planktonic foraminiferal assemblages. 6. A suite of easily recognized morphometric features that are now accurately and rapidly measured using the well-developed methodology.